Last year, the Autopilot platform offered users the option to replicate two portfolios: one managed by Grok and the other by ChatGPT. The platform enables users to mirror investment strategies. The most-copied portfolio on the platform is that of Nancy Pelosi, a Democratic lawmaker known for delivering stockmarket returns that would make even the best fund managers blush. 

The exact prompts used to run these portfolios are not known, but their management logic appears similar. The analysis is based on several criteria, including the macroeconomic backdrop, companies' financial data and sector readings, amongsy others. The assets are then scored by the AI, and 15 assets are selected each month. Here are the links to the two portfolios' ‘White Papers' to learn more: The GPT Portfolio White Paper V2;The Grok Portfolio White Paper.

Performance of the portfolio managed by Grok and that managed by GPT on the Autopilot platform since inception (12 February 2025 to 17 February 2026)

Over the same period, the S&P 500 delivered a 12% return. 

Let's take a look at these two portfolios today:

Grok: Vertiv (13%); Micron (9%); Broadcom (8%); NRG Energy (7%); AMD (7%); Meta (7%); Alphabet (6%); Energy sector ETF (6%); Eli Lilly (6%); Microsoft (6%); Semiconductor ETF; RTX (5%); Axon (5%); Gold ETF (5%); Nu Holding (4%). 

ChatGPT: Nvidia (10%); Inflation-linked bond ETF (10%); Gold ETF (9%); Vertiv (9%); Microsoft (7%); Constellation Energy (7%); Semiconductor ETF (7%); NRG Energy (6%); Eli Lilly (6%); Micron (6%); CBOE Global Market (5%); Lam Research (5%); Bitcoin spot ETF (5%); Mastercard (4%). 

Unsurprisingly, there is heavy exposure to tech. It is hardly surprising to see these portfolios outperform the US benchmark, given that tech and AI optimism are precisely what drove performance in the United States over the past year.

One might wonder whether these AIs have skilfully exploited the trend, or whether they are simply benefiting from a technology bias that happened to work in their favor. If it is merely a bias, a market reversal could easily leave them vulnerable. 

Is Grok the best investor? 

Across the many home-grown experiments carried out on the subject, one thing stands out: Grok seems better than its rivals, both in stock-picking and in trading.

Its main advantage would lie in its ability to take the market's pulse. Grok is continuously connected to posts on X. It can gauge sentiment, spot which authors truly move the needle, track message volumes and how they change…

The Pareto Investor, which published on Substack about Grok's performance in investment decisions, also points to other strengths. Grok is said to be designed to solve real-world problems in uncertain environments. And in more abstract contexts, it delivers better results than other LLMs.

After the meteoric rise of passive investing, AI is now, in turn, shaking up the role of stock-picking. So far, these models have only shone in a single market regime - that of the "AI revolution”. It will be interesting to track how these portfolios evolve over the longer term.